This 99% Invisible podcast episode talks about the unintended consequences of planting trees in the peat tundra of Scotland spurred by the British government's tax breaks to incentivize re-forestation around the country in the 1980s:

https://99percentinvisible.org/episode/for-the-love-of-peat/

EDIT: This is not to say that trees should not be planted. I wrote the post in support of using science and nuance to plant trees the right way, which I think is the major point of the article.